Improves the message generated when generating the folder for the compass data.

Outsources the encoding of the compass data into the file name
Written tests for the encoding
Did some internal cleaning of the class

Conflicts:
	src/main/java/appeng/block/solids/BlockSkyStone.java
	src/main/java/appeng/core/WorldSettings.java
	src/main/java/appeng/core/features/registries/PlayerRegistry.java
	src/main/java/appeng/core/sync/network/NetworkHandler.java
	src/main/java/appeng/core/worlddata/PlayerMapping.java
	src/main/java/appeng/core/worlddata/PlayerMappingsInitializer.java
	src/main/java/appeng/services/CompassService.java
	src/main/java/appeng/worldgen/MeteoritePlacer.java
	src/main/java/appeng/worldgen/MeteoriteWorldGen.java

src/api/java/appeng/api/features/IPlayerRegistry.java

@@ -1,7 +1,7 @@
 /*
  * The MIT License (MIT)
  *
- * Copyright (c) 2013 AlgorithmX2
+ * Copyright (c) 2013 - 2015 AlgorithmX2
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
@@ -24,10 +24,12 @@
 package appeng.api.features;
 
 
-import net.minecraft.entity.player.EntityPlayer;
+import javax.annotation.Nullable;
 
 import com.mojang.authlib.GameProfile;
 
+import net.minecraft.entity.player.EntityPlayer;
+
 
 /**
  * Maintains a save specific list of userids and username combinations this greatly simplifies storage internally and
@@ -55,5 +57,6 @@ public interface IPlayerRegistry
 	 *
 	 * @return PlayerEntity, or null if the player could not be found.
 	 */
+	@Nullable
 	EntityPlayer findPlayer( int playerID );
 }